Portable ultrafiltration unit



FIG. 1 is a front perspective view of a portable ultrafiltration unitshowing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a side elevational view thereof; and,

FIG. 6 is an opposite side elevational view thereof.

The ornamental design for a portable ultrafiltration unit, as shown.